''BACK-BORE'' REAMERS EXTL34

Get professional, repeatable shotgun barrel results with the Clymer “BACK-BORE” Reamers 12 Gauge Back-Bore Handle – EXTL34. Designed as the dedicated 34" extension handle for Clymer back-bore reamers, this rugged tool is the backbone of a complete 12-gauge back-boring system—giving gunsmiths the reach, control, and stability needed to ream bores and modify chokes from the breech end with confidence. Brownells Österreich+2brownells.lu+2

What the Clymer EXTL34 Back-Bore Handle Does

The EXTL34 isn’t a cutting reamer itself—it’s the purpose-built handle and extension that lets you run Clymer 12-gauge “BACK-BORE” reamers properly through the barrel:

• Designed specifically for Clymer 12 GA back-bore reamers (.725"–.740") Brownells Österreich+2Brownells+2

• 34" extension handle gives you the reach to operate from the breech while supporting the reamer along the bore Brownells Österreich

• Provides the leverage and control needed for smooth, even back-boring cuts

If you use or plan to use Clymer back-bore reamers in your shop, the EXTL34 handle is the essential companion piece that makes the system work the way Clymer intended.

Built for Professional Shotgun Back-Boring

Clymer “BACK-BORE” reamers are widely regarded as must-have tools in shotgun shops, and the EXTL34 handle is a key part of that system:

• Made for 12 gauge shotguns, the most common platform for back-boring and choke modifications Brownells Österreich+2Brownells UK+2

• Optimized for use with reamers that enlarge the bore in .005" increments from .725" to .740", letting you fine-tune bore and choke relationships Brownells Österreich+2Brownells+2

• Lead angles on the reamers match common choke angles, so with this handle you can back-bore and blend into existing choke constrictions smoothly Brownells Österreich+2Brownells UK+2

With the EXTL34 handle attached, you can confidently perform precise, straight, and controlled back-bore operations on a wide range of 12-gauge barrels.

Improve Bore-to-Choke Constriction & Shotgun Performance

When paired with Clymer back-bore reamers, the EXTL34 handle helps you:

• Enlarge the bore to easily change bore-to-choke constrictions for specific loads or disciplines Brownells Österreich+2Brownells UK+2

• Back-bore shortened barrels to within 2"–3" of the muzzle, creating useful constriction in what would otherwise be a pure cylinder bore Brownells Österreich+2Brownells Schweiz+2

• Back-bore an already-choked barrel to provide “extra” constriction for competitive shooters chasing tighter, more consistent patterns Brownells Österreich+2Primary Tactical+2

• Efficiently remove pits and roughness from pitted bores, improving both appearance and performance faster than grinding or polishing alone Brownells Österreich+2Brownells UK+2

The handle gives you the control to let the reamer do its job—resulting in smoother bores, more uniform patterns, and improved felt recoil characteristics. Primary Tactical+1

Heavy-Duty Construction & Shop-Ready Design

Clymer builds the EXTL34 12 GA Back-Bore Handle to stand up to daily professional use:

• Robust construction designed to support the load and torque of cutting with M-7 high-speed steel back-bore reamers Primary Tactical+2Brownells UK+2

• Delivery weight around 1.3 kg, providing solid, controllable mass while still being manageable on the bench or in a vise Brownells Österreich

• Secure attachment to the reamer ensures no slippage during use when properly tightened Brownells Österreich

With proper care and storage, the EXTL34 handle is designed to be a long-term, shop-grade investment that outlasts many of the barrels you work on.

Safe, Controlled Operation

The included safety guidance for Clymer back-bore systems emphasizes using the handle correctly:

• Always ensure the firearm is completely unloaded before beginning any work Brownells Österreich

• Use the correct handle and extension (EXTL34 for 12-gauge back-bore reamers) to maintain control during operation Brownells Österreich

• Apply steady, even pressure while turning the reamer; avoid forcing it to prevent chatter or barrel damage Brownells Österreich

• Regularly check depth and clean debris from the bore to avoid over-cutting and to maintain a smooth finish Brownells Österreich

The EXTL34 is designed to work as part of this system, giving you the leverage, reach, and ergonomics needed for safe, accurate back-boring.

Perfect for Shotgun Gunsmiths & Serious DIY Builders

The Clymer “BACK-BORE” Reamers 12 Gauge Back-Bore Handle EXTL34 is ideal for:

• Professional gunsmiths who regularly perform choke modifications, back-boring, or barrel refurbishing

• Competition shotgun specialists who tune bores and chokes for trap, skeet, sporting clays, and 3-gun

• Advanced DIY enthusiasts looking to add a professional-grade back-boring capability to their home shop

If you already own or are investing in Clymer 12 GA back-bore reamers, the EXTL34 handle is the tool that makes them truly practical and effective.

Key Features – “BACK-BORE” REAMERS EXTL34

From Clymer and major distributors: Brownells+3Brownells Österreich+3brownells.lu+3

• Brand: Clymer

• Product Name: 12 Gauge Back-Bore Handle – “BACK-BORE” Reamers

• Manufacturer Part Number: EXTL34

• Product No.: 184030012

• Gauge: 12 Gauge

• Style: Back-Bore system handle/extension

• Length: 34" extension handle (for 12 GA back-bore use)

• Intended Use: Handle/extension for Clymer 12 GA back-bore reamers (.725"–.740")

• Delivery Weight: Approx. 1.306 kg

• Made in USA

Why Choose the Clymer EXTL34 Back-Bore Handle?

• Purpose-built for 12-gauge Clymer “BACK-BORE” reamers

• Provides the reach and control needed for precise shotgun back-boring

• Integral part of a system that lets you reshape bore-to-choke constrictions, clean pitted bores, and optimize patterns

• Heavy-duty, USA-made construction built for professional shop environments

• Backed by Clymer’s long-standing reputation in precision reamers and gunsmithing tools

If you want to deliver top-tier shotgun back-bore and choke modification work, pairing Clymer’s precision reamers with the “BACK-BORE” REAMERS EXTL34 12 Gauge Back-Bore Handle is the professional way to do it.

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